MU Online Season 20 Guide

Season 20 (2024-2025) adds the Alchemist, the first new class since the Illusion Knight, and with her the Temple Guard Legendary gear tier that turns every +15 Lightning weapon into a set item with its own upgrade levels and stages. Two hunting grounds open - the Kardamahal Underground Temple and the Swamp of Ruin - the Rune Wizard is rebuilt around a new Magic Power stat, Tauros becomes the 7th Guardian, the Frigid Earring is the 8th mastery earring, and the level cap moves to 1,700.

The Alchemist — a new magic class

The Alchemist is a magic class built around transmutation. She fights with a wand in the right hand and an elixir in the left, has high defence for a caster, and scales her skill damage with Energy. Her signature contribution to a party is a support skill that summons an extra hunting ground monster, so the whole party farms faster.

Her story starts in Elbeland. Lea was born with a freak talent for alchemy, was transmuting matter into gold by the age of nine, and turned so much of her village to gold that word reached Kundun. He invaded Elbeland to take her and killed her parents; she escaped, and at sixteen set out to destroy him. She has never performed gold transmutation since and studies only combat alchemy.

Her starting gear and spell books are sold in Elbeland: Lea (29, 236) carries the low level armour, Marce (36, 219) the low level weapons and the four skill books. She also uses part of the Dark Wizard's skill list alongside her own transmutation spells.

Alchemist transmutation skills

Confusion Stone is the skill the class is built around, so it is worth reading the small print: only one stone can be active per party, the summoned monster disappears after roughly a minute if nobody kills it, and the experience it gives scales with the Alchemist's alchemy rate, which grows with Vitality and caps at 100%. None of the four transmutation skills has a cooldown except Confusion Stone.

Alchemist wands, elixirs and armour

The Blessed Archangel's Absolute Wand sits outside the tier ladder at 173 ~ 185 magic, 94% with Str 86, Agi 38, Ene 148.

Requirements are the same across every Excellent tier: Str 177 / 198 / 188 / 130 / 146, Agi 109 / 114 / 109 / 93 / 98, Energy 790 / 804 / 776 / 755 / 769. The four piece (set) versions carry higher defence and the usual set options, with Triple Damage rate climbing from 2% on the Soul set to 14% on the Lightning set. There are also two socket sets: Integrity (380 socket) and Justice (400 socket).

Alchemist wings

The Wing Core of Pure Insight adds +50 to wing attack, magic and curse power and can be mounted on the Wing of Inevitability or the Wing of Insight.

Kardamahal Underground Temple

Kardamahal is an elemental hunting ground, so MU Helper Plus can send you straight to the main or sub-main spot of the element you want. Monsters carry Excellent Damage Rate resistance, Critical Damage Rate resistance, Damage Absorption, Debuff Rate resistance and a Shock stat. A safe zone exists on the map and you are returned to it on entry, on death and on reconnect. The headline drop is the Lightning Chaos Combination Amulet Fragment.

The elite zone has its own flag at the entrance, and its monsters are treated like bosses — they are immune to Divine Punishment, and every one of their attacks lands an elite debuff with 100% chance. Which debuff you get depends on the element of the monster, and the Guardian's elite resistance option is what reduces it.

Elite monsters drop a weekly-capped list on top of the normal loot: Elite Option Change Piece (50 make an Elite Option Change Stone), Sealed Armour Piece (50 craft one part of Scratched Blood Angel armour, which then crafts a +13 Blood Angel piece without a Soul of Blood Angel), Elite Guardian Reinforcement Stone, Golden Sentence, Garuda's Flame, Uriel's Feather and the Jewel of Harmony. The Twisted Kalutan elite zone was removed in the same patch.

Later in Season 20 the Kardamahal elite zone itself was removed and replaced by normal monsters, when the Swamp of Ruin elite zone opened.

Swamp of Ruin

Explorers investigating the Swamp of Calmness found statues, a plaza, an altar and a graveyard on its islands, but no people. They rebuilt the shattered magic circle from its fragments and activated it; instead of the familiar light it threw up an ominous purple pillar, and the statue's eyes lit. It carried them to a vast dark island where the same creatures they had met in the swamp were crackling with far more power. The monsters that once crossed to the Swamp of Calmness had weakened with distance — here they had not. This is the Swamp of Ruin.

The main drops here are the Excellent socket pendant, the (Bound) Temple Guard Enhancement Stone and Excellent Temple Guard armour. The elite monsters add the same weekly-capped list as Kardamahal: Sealed Armour Fragment, Elite Guardian Enhancement Stone, Elite Option Change Fragment, Golden Crest, Garuda's Flame, Uriel's Feather and the Jewel of Harmony.

Legendary equipment — the Temple Guard tier

Legendary is the tier above 10th Mastery. You feed a finished Lightning item into the Chaos Goblin and get a Temple Guard set item back, which then has its own upgrade levels and stages to climb.

Swords and staves need a dedicated anvil rather than the plain one: Anvil (Wrath) makes the Temple Guard Sword, Anvil (Faith) the Faith Sword, Anvil (Wizard) the Wizard Staff, Anvil (Magic) the Magic Staff and Anvil (White Wizard) the White Wizard Staff.

Three option rules changed with the tier. A stat option (All Stats +7 or +15) is now rolled on Legendary weapons and shields, the Jewel of Life option is gone from Legendary Excellent and set gear, and Luck was rewritten from Jewel of Soul success +25% to upgrade success rate +10% (the critical damage rate +5% half is unchanged). Set defence also stopped being a percentage and became a flat value: 350 at level 10 rising to 600 at level 15, read from the lowest upgrade level you are wearing.

Legendary upgrade levels and stages

A Legendary set item carries two numbers instead of one. The upgrade level runs 0 to 15 and raises base stats the way ordinary upgrading always did. The upgrade stage runs 1 to 5 inside each level and adds a per-item effect — attack power on a Temple Guard Sword, magic power on a staff. You climb stages first, and a stage-5 item is what the level upgrade accepts.

The rate and the material count are the same at every level and every stage, which makes the maths unusually simple for Mu Online. The Luck Amulet works as an optional support material; the Chaos Combination Amulet does not, because Legendary set equipment never disappears on failure.

Temple Guard weapons, shields and armour

Every one of them needs 5th class and level 1,500. Legendary weapons carry a fixed Excellent option of Excellent damage rate +10% plus one or two random rolls from attack speed +7, life or mana on kill, attack power +3.4 per 20 levels, and attack power +97.

The Fairy Shield adds a fixed Elf-only elemental defence enhancement of 52%. All four share the same Excellent list: base defence +3.4 per 20 levels as the fixed option, then one or two of damage reflect 5%, defence success rate +10%, max HP +374, max mana +374 and damage decrease 102 — with the Lancer Shield swapping the last one for Obsidian effect +315.

Almost every class shares the same 4-set block: Mastery critical damage, Mastery excellent damage, ignore enemy defence +9%, Mastery all stats, Mastery base defence, critical damage rate +20%, excellent damage rate +20%, Triple Damage rate +16%, Mastery max HP, Mastery damage decrease and Mastery ability-skill attack. Two sets break the pattern — the Dark Knight (Faith) set trades it for critical and excellent damage rate +55% and Solid Blessing bonuses, and the Elf (Energy) set for healing and elemental enhancements.

Completing the full Legendary set — four armour pieces plus the matching Temple Guard weapon and shield — is identical for every class: Extra Critical rate +5%, Extra Excellent rate +5%, Extra Double Damage rate +3%, Extra Additional Damage rate +4%.

Rune Wizard renewal

The Rune Wizard was rebuilt around a new stat. Magic Power now appears in the character window, and rune maces lost their one-handed attack power line in favour of a magic power min ~ max option. Every rune mace was re-costed at the same time.

The eleven new shields share a fixed Excellent option of base defence per 20 levels and up to two random rolls from damage reflect 5%, defence success rate +10%, max HP, max mana and damage decrease.

Buffs and skills

Two skills are new. Runic Spear (2nd class, Energy 600, learned from monster hunting) spins rune letters into an explosion that hits the target and everything around it. Rune Phrase (3rd class, Energy 1,180, Plasma Ball plus 10 points of Plasma Ball Mastery, bought from Elbeland's NPC James in the Ruud shop) fires explosive runes through a magic orb at a group; cast it three times and Special Phrase can trigger a defence −30% debuff on the target, though major bosses are immune. A 5th class ability card, Rune Phrase of Saturation, adds splash damage in HP, MP and AG variants. Plasma Ball Enhancement was removed from the 4th skill tree.

The 7th Guardian — Tauros

Tauros is the 7th Guardian, an inventory-equipped mount. You make one by upgrading a Leviathan at the Lorencia Trainer (122, 110). The base Leviathan has to be +11 or better and the success rate depends on how far you pushed it.

Every attempt costs Jewel of Bless x20, Jewel of Soul x20, Jewel of Chaos x1, Jewel of Creation x1 and one Seal of Tauros, sold by Priest James in Elbeland (32, 239) for 50,000 Ruud. A failed combination eats the sub-materials and drops the base Guardian to +0. A successful one re-rolls the normal options and the elite resistance option.

Frigid Earring — the 8th mastery earring

Each earring rolls one to three random options, and the mastery values on them climb with the earring's enhancement level (up to +15, using crafting stones from the Chaos Goblin).

Wearing both halves turns on the set option: ignore enemy defence chance 8%, all stats +11 and mastery damage +100.

You do not find a Frigid Earring — you upgrade a Verdant Earring (the 7th mastery earring) of +11 or better, using a Frigid Crafting Mould from Priest James in Elbeland (32, 239) for 25,000 Ruud, plus Jewel of Bless x20, Jewel of Soul x20, Jewel of Chaos x1 and Jewel of Creation x1. Rates match the Guardian ladder: 100% from +15 down to 60% from +11. A left earring upgrades into a left earring and a right into a right, and the new earring rolls one to three fresh options.

Level cap 1,700 and season rewards

The maximum character level moved from 1,650 to 1,700. Until the next season you can claim both achievement rewards, which arrive through the Gremory Case — 30 days to collect, then 14 days of validity on the box itself. Drop a reward box on the ground and it becomes a muun.

Level-up experience for characters of level 1,551 and above was rewritten at the same time, and the experience already banked is carried into the new curve — so a character sitting just short of 1,551 may find its level and experience bar jump on the patch.

Experience from high level monsters also gained a new rule. From Kardamahal onwards, if your level is at least monster level + 600 you get the full 100%; below that you lose 10% per level of difference, capped at a 70% loss, so you always keep at least 30%.

Play improvements

Death penalty recovery

An Experience Recovery Potion (paid item, stacks to 255) can give back the experience a death cost you. When you die, a recovery icon appears at the top left of the screen; open it and click the entry you want back. The window stores up to 10 entries and deletes the oldest when it overflows, each entry lasts 24 hours, only law-abiding characters can use it, and the number of potions consumed depends on your level and how much experience you lost. On MU Blue's Gold Channel one recovery per day is free. Character transfer, server transfer and name change all wipe the stored entries.

Event map tickets unified

The graded +1~7 tickets for Blood Castle, Devil Square and Illusion Temple are gone. One ticket now covers every grade, existing graded tickets convert automatically, and the graded combination materials stop working. The shop sale price of every ticket and ticket material dropped to 0 Zen, and Crywolf's combination rate +5% success reward was removed because the base rates absorbed it.

Entry rules and the Labyrinth

On entry only the stats of mounts and transformation rings apply, not their appearance, and party status is kept. Inside the Labyrinth the league list swapped class icons for a tooltip on the character name.

Combination and guild UI

The Chaos Goblin's combination menu gained Elite Equipment Enhancement, Mastery Crafting and Legendary Crafting as separate entries, and dropping the main material into the window now registers the secondary materials automatically — only the amulets stay optional. Guild matching was reworked too: recruitment settings are written and registered in one tab, a 100-character guild introduction replaced the interest and class filters, level ranges are typed instead of ticked, join requests are approved or rejected with O/X buttons in a queue, and the old standalone guild window became a Guild Information tab that [G] opens.

Other changes

Blessing of Uniris is a new buff for 5th class characters that grants +50% experience from monsters and stacks with the Seal of Master Level Increase; it is sold permanently in the Goblin Point Shop. Kardamahal monsters give more experience than at launch. The Monster Soul Converter was re-tiered, with the level 5 converter now recommended at level 1,450 and taking Storm Guard, Twisted Crypta, Devil Sword and Shadow Master of Ruin souls. Together Boss Raid monsters moved from level 100 to 105, with HP up from 100,000,000 to 136,500,000.